Home / 139,355.25-192,312.77-78,938.43

Finding the Fourth Proportional to 139,355.25, 192,312.77 and 78,938.43

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Solution

The fourth proportional to 139,355.25, 192,312.77 and 78,938.43 is: 108,936.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,355.25 : 192,312.77 = 78,938.43 : x
  2. Step 2: Convert to fraction form
    139,355.25/192,312.77 = 78,938.43/x
  3. Step 3: Cross multiply
    139,355.25x = 192,312.77 × 78,938.43
  4. Step 4: Simplify right side
    139,355.25x = 15,180,868,132.75
  5. Step 5: Solve for x
    x = 15,180,868,132.75/139,355.25
  6. Step 6: Final answer
    x = 108,936.46

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.